They're a fairly regular type of polarised electrolytic capacitor. The datasheet is here. The only point of difference they have is an insulated shell (which is why they look different to most other caps).

Personally, unless the price is really good, I wouldn't get them. I used to buy bulk lots of caps like this, but I found that it is better to just buy them when I need them.

Also, due to their age, they will probably need to be reformed before use. Not to hard to do, but time consuming. They may also have a higher than normal ESR.

i will look for something a little newer.
bought a couple of bags with other brands that was dated to 03 and didnt seem to be any problem with those. just put em in and fire it up.
sounded at best after a day or two.

i looked at the datasheet for the 036 caps. never heard of a "semi professional" capacitor before.